Stratum rock debris supporting and packing device

Abstract

The invention discloses a stratum rock debris supporting and packing device. The stratum rock debris supporting and packing device comprises a first cylindrical body and a second cylindrical body which are sequentially connected, a first hydraulic thrust system and a supporting mechanism are sequentially arranged on the side wall of the outer side of the first cylindrical body from top to bottom,and a second hydraulic thrust system, a packing mechanism and a fixing sleeve are sequentially arranged on the side wall of the outer side of the second cylindrical body from top to bottom; and the first hydraulic thrust system and the second hydraulic thrust system act on the supporting mechanism and the packing mechanism correspondingly, axially downward pressure is applied to the supporting mechanism and the packing mechanism simultaneously under the hydraulic effect, and therefore the supporting mechanism and the packing mechanism expand radially due to being pressed. According to the stratum rock debris supporting and packing device, the problems of fallen rock debris supporting and permanent acting are effectively solved, effective packing is conducted on the upper and lower well sections, it is ensured that a borehole section located below the stratum rock debris supporting and packing device is effectively protected, normal mining and packing can be conducted on an oil and gaswell, therefore the shaft quality is improved, and the oil and gas recovery rate is increased.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a formation cuttings support and isolation device. Background technique [0002] During the drilling construction, it is often encountered that the easily collapsed formations are prone to collapse and drop cuttings. For example, if the oil and gas well is designed to be completed with open holes, the upper part of the well section of the production zone contains a collapsible formation, and the collapsed cuttings will block the lower wellbore or production zone, thereby affecting the recovery rate, and even causing the oil and gas well to be scrapped. Some people put the hydraulic expandable packer in the lower part of the easily collapsed well section for support and isolation, but it can only solve the short-term problem. As time goes by, the packer rubber sleeve will age and rupture, and the filled mud will flow out Afterwards, t...

AI Technical Summary

Problems solved by technology

For example, if the oil and gas well is designed to be completed with open holes, the upper part of the well section of the production layer contains a easily collapsed formation, and the collapsed cuttings will block the lower wellbore or production layer, thereby affecting the recovery rate, and even causing the oil and gas well to be scrapped

Some people put the hydraulic expandable packer in the lower part of the easily collapsed well section for support and isolation, but it can only solve the short-term problem. As time goes by, the packer rubber sleeve will age and rupture, and the filled mud will flow out Afterwards, the sealing of the annulus will fail, causing cuttings to fall directly to the bottom of the well from the annulus, resulting in clogging of production layers and affecting oil and gas production

In addition, the expansion space of the outer diameter of the packer is limited, and it is impossible to achieve effective support for the large diameter part

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